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Articles on Trending Technologies
Technical articles with clear explanations and examples
Nth Catalan Number in Go Lang
Catalan Numbers are sequences of natural numbers that gives the number of BST (Binary Search Tree) possible with n Values. So, the Catalan number is a full binary tree with n+1 leaves.Some applications of Catalan Numbers are counting the pairs of nested parentheses, valid mountain ranges etc.For n = 5, C = (C(0) * C(4)) + (C(1) * C(3)) + (C(2) * C(2)) + (C(3) * C(1)) + (C(4)* C(0))Thus, we can see that Catalan numbers are in the form of a recursive relation, i.e., for the nth term, the Catalan number Cn is, ...
Read MoreHow to plot matrix columns as lines in base R?
To plot matrix columns as lines in base R, we can use matplot function but we need to read the matrix as a data frame using as.data.frame function and for creating lines the type argument will be used. For example, if we have a matrix called M then the columns of M can be plotted as lines using the command matplot(as.data.frame(M),type="l").Consider the below data frame −ExampleM
Read MoreDetermine the position of the third person on regular N sided polygon in C++ Program
In this tutorial, we are going to learn how to find the position of a third person on a regular N-sided polygon.We have given a regular N-sided polygon. And there are two persons on two different points already. Our task is to find the third point to place the third person such that the distance between the first two persons and the third person is minimized.Let's see the steps to solve the problem.Initialize the N and two points A and B.Initialize the position of the third person, and the minimum sum to find the position.Iterate from 1 to N.If the ...
Read MoreDiagonal of a Regular Heptagon in C++ Program
In this tutorial, we are going to learn how to find the diagonal of a regular heptagon.We have to find the length of the diagonal of the regular heptagon using the given side. The length of the diagonal of a regular heptagon is 1.802 * s where s is the side of the heptagon.ExampleLet's see the code.#include using namespace std; float heptagonDiagonal(float s) { if (s < 0) { return -1; } return 1.802 * s; } int main() { float s = 7; cout
Read MoreWrite a program in C++ to replace all the 0's with 5 in a given number
Given an integer N, the task is to replace all the 0’s that appear in the number with ‘5’. However, the number with leading ‘0’ cannot be replaced with ‘5’ as it remains unchanged. For example, Input-1 −N= 1007Output −1557Explanation − The given number has 2 zeros which when replaced by ‘5’ results in the output as 1557.Input-2 −N = 00105Output −155Explanation − Since the given number starts with the leading ‘0’ which can be ignored and the output after replacing the 0 in the middle with ‘5’ results the output as 155.Approach to Solve this ProblemTo replace all the ...
Read MoreHow to save a csv and read using fread in R?
To save a csv file, we can use write.csv function in R and if we want to read it using fread then fread function will be used with the name of the csv file. The benefit of reading the csv file with fread function is that there will be a variable added to the original csv file which contains the id as integers starting from 1 to the length of column values.Consider the below data frame −Examplex
Read MoreDiagonal of a Regular Pentagon in C++ Program
In this tutorial, we are going to learn how to find the diagonal of a regular pentagon.We have to find the length of the diagonal of the regular pentagon using the given side. The length of the diagonal of a regular pentagon is 1.22 * s where s is the side of the pentagon.ExampleLet's see the code.#include using namespace std; float pentagonDiagonal(float s) { if (s < 0) { return -1; } return 1.22 * s; } int main() { float s = 7; cout
Read MoreReverse Vowels of a string in C++
Given a string, the task is to reverse all the vowels present in the given string. For example, Input-1 −a = “tutor”Output −toturExplanation − Reversing the string “tutor” will generate the output as “totur.Input-2 −a = “mathematics”Output −mithametacsExplanation − Reversing the string “mathematics” will generate the output as “mithametacs”.Approach to solve this problemGiven a string, we have to reverse all the vowels present in it. There are several approaches to solve this particular problem but we have to solve this in linear time O(n).Thus, the better method to solve this problem is to use the Two-Pointer approach in which we ...
Read MoreHow to hide NA values in an R matrix?
The hiding of NA values does not mean removal of NA values. If we have some NA values in an R matrix then we can hide them using blanks with double quotes. For example, suppose we have a matrix called M that contains some NA values then M can be printed by hiding NA value using print.table(M,na.print="")ExampleM1
Read MoreHow to fill NA values with previous values in an R data frame column?
To fill NA values with next and previous values, we can use na.locf function of zoo package with fromLast = TRUE. This is the situation of a column as shown below −x 0 NA NA 1 1 NA 0 1The output after filling NA values with next and previous values will be −x 0 0 0 1 1 1 0 1Consider the below data frame −Examplex1
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